I've got a pair of HomePods running 11.4 (15F80) that are paired. They show up as a single 'Living Room' unit (with the 'stacked' HomePods icons) in my Home app. No matter what I use to play sound through them (the 'TV' app, 'Music', VLC, YouTube, etc), they show up as individual HomePods. I can select both of them, and the sound will play through both of them, but it's playing as if they're in separate rooms rather than as a cohesive pair (eg. if I say 'siri, set volume to 30%, only one of them adjusts, etc). They're up to date on their OS versions. I've unpaired them and re-paired them. I've rebooted my iOS devices (iPad Pro running 12.0b2 and iPhone X running the latest beta of 11.4.1 (15G5074a). Nothing I do seems to make it better. Any hints?